Debugging with GDB Manual HP WDB v6.3 (5900-2180, August 2012)

unknown symbol type 0xnn The symbol information contains new data types that GDB
does not yet know how to read. 0xnn is the symbol type of
the uncomprehended information, in hexadecimal.
GDB circumvents the error by ignoring this symbol
information. This usually allows you to debug your program,
though certain symbols are not accessible. If you encounter
such a problem and feel like debugging it, you can debug
(gdb) with itself, breakpoint on complain, then go up to
the function read_dbx_ symtab and examine *bufp to
see the symbol.
stub type has NULL name GDB could not find the full definition for a struct or class.
const/volatile indicator missing (ok
if using g++ v1.x), got...
The symbol information for a C++ member function is
missing some information that recent versions of the compiler
should have output for it.
info mismatch between compiler and
debugger
GDB could not parse a type specification output by the
compiler.
100 GDB Files